How can we improve the Unfavinator?

Twitter no longer recognizes Unfavinator

I was trying to test out the unfavinator app on another account but it looks like it just gets stuck in a login loop and Twitter is kicking off 2016 by not allowing it access -

Here's how to replicate:

*Sign in to your twitter account
Go to Unfavavinator.com
Click "Sign in with Twitter"
Click "Authorize this app"
Wait for Redirecting message
You will be redirected back to the "Sign in with Twitter" page again...

1)If Unfavinator is already granted access on an account it becomes broken (it can't see your favs)
2)If you delete access and regrant access it doesn't recognize the access on Twitter